Wilder



G. W.GILBERT @L M. G. WILDBR.

v Diaphragm.

Fl' l fig. 2.

GEORGE W. GILBERT AND MOSES G. WIEDER, orv BROOKLYN, NEW YORK,

ASSIGNORS TO THE NEW YORK GAS CONTROLLER COMPANY.

naPaOvEWitN-t: la naam-macias Specification forming part of Letters Patent No/'lilhd., dated September 9, 1879;, application filed August 2, 1879.

l latingthe pressipe and supply of gasesor fluids under pressure, It isnioie especially applicable to diaphrzgms for small regulators, such as are used for/ gulatin g one burner or a small number-of burners g .but it may also be applied to larger gas-regulators, and also to various kinds of pressureregulators.

The object of the invention is to-provide a diaphragm which shall be of uniform thickness and Strength throughout its entire body,v

and shall also be impervious both to gas and to moisture, and Shall remain unaffected by changesof temperature.

The invention consists in the improved'process bywhich the diaphragm is prepared orproduced, as hereinafter particularly set forth,

and also in a diaphragm,ias anew orimproved article of manufacture, madefrom paper or brous material'of linen or similar substance, coated with collodion, and treatedin the man.- ner hereinafter described.

In the accompanying drawings, Figurel rep resents aplan View of our improved diaphragm, and Fig. 2 a transverse section of the same.

Similar letters of reference indicate the same parts in both the figures.-

The material from which the diaphragm is made is paper or fabric of linen or similar-material of suitable thickness, the thickness thereof being proportionedfto its .size or diameter, and the process-by which we prepare it for the purposes above indicated is as follows,n amely: We take a sheet orsheets of the linen (or other) paper or fabric, and either immerse the same in collodioii or apply collodion thereto, ,on both sides thereof, by means of a brush or similar means, so that the collodion shall be evenly spread over the entire surface thereof. and permeate the entire substance of the p aper or ber. What is known to the trade as iiexi ble collodion is preferred for this purpose. When 'the collodion is nearly dry We form concentric corrugations b on 'the diaphragm by pressing it between suitable dies, for the purpose of increasing its iexibility and elasticity,

- and securing a'suitable degree of fullness and of linflection under pressure, after which, in order that the body of the diaphragm shallbe evenly and uniformly stretched, we iixit in position in the case (represented| by c) in which it is to be used, so that when the collodion has dried the diaphragm `will 'be stretched evenly and uniformly. We then place the diaphragm and the case in which it is secured in an. oven of any suitable kind, and gradually increase the heat therein until it reaches about 2200 Fahrenheit, allowing them to remain therein about thirty minutes, (more or less,) and by this means the diaphragm is renderedpermanentl y water-proof' and gas-proof, and will remain unaffected either by moisture, or by the gas, or by changes of temperature.

A diaphragm made and applied in the manner above described is more sensitive and more uniform in its action than is one'made of meta-l or any other materiahand will remain unaffected for an indefinite length of time, either by the gas brought in contact therewith, or by lmoisture or changes of tempera-ture, and its operation will be uniform and equal under all conditions; and in addition to these advantages itis comparatively inexpensive and is easily handled. i

We may state that we do not confine our-` selves'exclusively to paper or fiber made from linen, as a'paper orl fibrous material made from silk or cotton or other substances, when treated as 'before describedfmay be employed; but linen is thehpreferred substance. Neither do we confine ourselves to the exact means shown in the drawings for securing thediaphragm in its case, as these may be' modified or changed Without chan ging vor .altering the principle of our invention, the object being to secure a' uniform and equal tension" throughout the body of the diaphragm by placing the same in position in its .case before the collodion is dried or seasoned. y

What we claim asour inventionisi l. The process hereinbefore described for producing a diaphragm from paper orber made 2 ensmsg 'from linen or similar material, the said process similar material, coated with collodion, and

consisting in coating both sides thereof with treated as hereinletbre set forth.

collodion, then corrugat'ing it with concentric GEORGE W GILBERT corrugations, and afterward baking or season-y MOSES G VVQHLDER ing' it While placed in position in its case, all as herein described and set. forth. Witnesses:

2. As a new article of manufacture, a diat JOHN S. THORNTON,

phragm of paper or ber made fromlinen orl WALTER NICHOLS. 

